--- /dev/null
+/*
+ * USB driver for Gigaset 307x base via direct USB connection.
+ *
+ * Copyright (c) 2001 by Hansjoerg Lipp <hjlipp@web.de>,
+ * Tilman Schmidt <tilman@imap.cc>,
+ * Stefan Eilers.
+ *
+ * =====================================================================
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ * =====================================================================
+ */
+
+#include "gigaset.h"
+#include <linux/usb.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+
+/* Version Information */
+#define DRIVER_AUTHOR "Tilman Schmidt <tilman@imap.cc>, Hansjoerg Lipp <hjlipp@web.de>, Stefan Eilers"
+#define DRIVER_DESC "USB Driver for Gigaset 307x"
+
+
+/* Module parameters */
+
+static int startmode = SM_ISDN;
+static int cidmode = 1;
+
+module_param(startmode, int, S_IRUGO);
+module_param(cidmode, int, S_IRUGO);
+MODULE_PARM_DESC(startmode, "start in isdn4linux mode");
+MODULE_PARM_DESC(cidmode, "Call-ID mode");
+
+#define GIGASET_MINORS 1
+#define GIGASET_MINOR 16
+#define GIGASET_MODULENAME "bas_gigaset"
+#define GIGASET_DEVNAME "ttyGB"
+
+/* length limit according to Siemens 3070usb-protokoll.doc ch. 2.1 */
+#define IF_WRITEBUF 264
+
+/* interrupt pipe message size according to ibid. ch. 2.2 */
+#define IP_MSGSIZE 3
+
+/* Values for the Gigaset 307x */
+#define USB_GIGA_VENDOR_ID 0x0681
+#define USB_3070_PRODUCT_ID 0x0001
+#define USB_3075_PRODUCT_ID 0x0002
+#define USB_SX303_PRODUCT_ID 0x0021
+#define USB_SX353_PRODUCT_ID 0x0022
+
+/* table of devices that work with this driver */
+static const struct usb_device_id gigaset_table[] = {
+ { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_3070_PRODUCT_ID) },
+ { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_3075_PRODUCT_ID) },
+ { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_SX303_PRODUCT_ID) },
+ { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_SX353_PRODUCT_ID) },
+ { } /* Terminating entry */
+};
+
+MODULE_DEVICE_TABLE(usb, gigaset_table);
+
+/*======================= local function prototypes ==========================*/
+
+/* function called if a new device belonging to this driver is connected */
+static int gigaset_probe(struct usb_interface *interface,
+ const struct usb_device_id *id);
+
+/* Function will be called if the device is unplugged */
+static void gigaset_disconnect(struct usb_interface *interface);
+
+/* functions called before/after suspend */
+static int gigaset_suspend(struct usb_interface *intf, pm_message_t message);
+static int gigaset_resume(struct usb_interface *intf);
+
+/* functions called before/after device reset */
+static int gigaset_pre_reset(struct usb_interface *intf);
+static int gigaset_post_reset(struct usb_interface *intf);
+
+static int atread_submit(struct cardstate *, int);
+static void stopurbs(struct bas_bc_state *);
+static int req_submit(struct bc_state *, int, int, int);
+static int atwrite_submit(struct cardstate *, unsigned char *, int);
+static int start_cbsend(struct cardstate *);
+
+/*============================================================================*/
+
+struct bas_cardstate {
+ struct usb_device *udev; /* USB device pointer */
+ struct usb_interface *interface; /* interface for this device */
+ unsigned char minor; /* starting minor number */
+
+ struct urb *urb_ctrl; /* control pipe default URB */
+ struct usb_ctrlrequest dr_ctrl;
+ struct timer_list timer_ctrl; /* control request timeout */
+ int retry_ctrl;
+
+ struct timer_list timer_atrdy; /* AT command ready timeout */
+ struct urb *urb_cmd_out; /* for sending AT commands */
+ struct usb_ctrlrequest dr_cmd_out;
+ int retry_cmd_out;
+
+ struct urb *urb_cmd_in; /* for receiving AT replies */
+ struct usb_ctrlrequest dr_cmd_in;
+ struct timer_list timer_cmd_in; /* receive request timeout */
+ unsigned char *rcvbuf; /* AT reply receive buffer */
+
+ struct urb *urb_int_in; /* URB for interrupt pipe */
+ unsigned char *int_in_buf;
+ struct work_struct int_in_wq; /* for usb_clear_halt() */
+ struct timer_list timer_int_in; /* int read retry delay */
+ int retry_int_in;
+
+ spinlock_t lock; /* locks all following */
+ int basstate; /* bitmap (BS_*) */
+ int pending; /* uncompleted base request */
+ wait_queue_head_t waitqueue;
+ int rcvbuf_size; /* size of AT receive buffer */
+ /* 0: no receive in progress */
+ int retry_cmd_in; /* receive req retry count */
+};
+
+/* status of direct USB connection to 307x base (bits in basstate) */
+#define BS_ATOPEN 0x001 /* AT channel open */
+#define BS_B1OPEN 0x002 /* B channel 1 open */
+#define BS_B2OPEN 0x004 /* B channel 2 open */
+#define BS_ATREADY 0x008 /* base ready for AT command */
+#define BS_INIT 0x010 /* base has signalled INIT_OK */
+#define BS_ATTIMER 0x020 /* waiting for HD_READY_SEND_ATDATA */
+#define BS_ATRDPEND 0x040 /* urb_cmd_in in use */
+#define BS_ATWRPEND 0x080 /* urb_cmd_out in use */
+#define BS_SUSPEND 0x100 /* USB port suspended */
+#define BS_RESETTING 0x200 /* waiting for HD_RESET_INTERRUPT_PIPE_ACK */
+
+
+static struct gigaset_driver *driver;
+
+/* usb specific object needed to register this driver with the usb subsystem */
+static struct usb_driver gigaset_usb_driver = {
+ .name = GIGASET_MODULENAME,
+ .probe = gigaset_probe,
+ .disconnect = gigaset_disconnect,
+ .id_table = gigaset_table,
+ .suspend = gigaset_suspend,
+ .resume = gigaset_resume,
+ .reset_resume = gigaset_post_reset,
+ .pre_reset = gigaset_pre_reset,
+ .post_reset = gigaset_post_reset,
+ .disable_hub_initiated_lpm = 1,
+};
+
+/* get message text for usb_submit_urb return code
+ */
+static char *get_usb_rcmsg(int rc)
+{
+ static char unkmsg[28];
+
+ switch (rc) {
+ case 0:
+ return "success";
+ case -ENOMEM:
+ return "out of memory";
+ case -ENODEV:
+ return "device not present";
+ case -ENOENT:
+ return "endpoint not present";
+ case -ENXIO:
+ return "URB type not supported";
+ case -EINVAL:
+ return "invalid argument";
+ case -EAGAIN:
+ return "start frame too early or too much scheduled";
+ case -EFBIG:
+ return "too many isoc frames requested";
+ case -EPIPE:
+ return "endpoint stalled";
+ case -EMSGSIZE:
+ return "invalid packet size";
+ case -ENOSPC:
+ return "would overcommit USB bandwidth";
+ case -ESHUTDOWN:
+ return "device shut down";
+ case -EPERM:
+ return "reject flag set";
+ case -EHOSTUNREACH:
+ return "device suspended";
+ default:
+ snprintf(unkmsg, sizeof(unkmsg), "unknown error %d", rc);
+ return unkmsg;
+ }
+}
+
+/* get message text for USB status code
+ */
+static char *get_usb_statmsg(int status)
+{
+ static char unkmsg[28];
+
+ switch (status) {
+ case 0:
+ return "success";
+ case -ENOENT:
+ return "unlinked (sync)";
+ case -EINPROGRESS:
+ return "URB still pending";
+ case -EPROTO:
+ return "bitstuff error, timeout, or unknown USB error";
+ case -EILSEQ:
+ return "CRC mismatch, timeout, or unknown USB error";
+ case -ETIME:
+ return "USB response timeout";
+ case -EPIPE:
+ return "endpoint stalled";
+ case -ECOMM:
+ return "IN buffer overrun";
+ case -ENOSR:
+ return "OUT buffer underrun";
+ case -EOVERFLOW:
+ return "endpoint babble";
+ case -EREMOTEIO:
+ return "short packet";
+ case -ENODEV:
+ return "device removed";
+ case -EXDEV:
+ return "partial isoc transfer";
+ case -EINVAL:
+ return "ISO madness";
+ case -ECONNRESET:
+ return "unlinked (async)";
+ case -ESHUTDOWN:
+ return "device shut down";
+ default:
+ snprintf(unkmsg, sizeof(unkmsg), "unknown status %d", status);
+ return unkmsg;
+ }
+}
+
+/* usb_pipetype_str
+ * retrieve string representation of USB pipe type
+ */
+static inline char *usb_pipetype_str(int pipe)
+{
+ if (usb_pipeisoc(pipe))
+ return "Isoc";
+ if (usb_pipeint(pipe))
+ return "Int";
+ if (usb_pipecontrol(pipe))
+ return "Ctrl";
+ if (usb_pipebulk(pipe))
+ return "Bulk";
+ return "?";
+}
+
+/* dump_urb
+ * write content of URB to syslog for debugging
+ */
+static inline void dump_urb(enum debuglevel level, const char *tag,
+ struct urb *urb)
+{
+#ifdef CONFIG_GIGASET_DEBUG
+ int i;
+ gig_dbg(level, "%s urb(0x%08lx)->{", tag, (unsigned long) urb);
+ if (urb) {
+ gig_dbg(level,
+ " dev=0x%08lx, pipe=%s:EP%d/DV%d:%s, "
+ "hcpriv=0x%08lx, transfer_flags=0x%x,",
+ (unsigned long) urb->dev,
+ usb_pipetype_str(urb->pipe),
+ usb_pipeendpoint(urb->pipe), usb_pipedevice(urb->pipe),
+ usb_pipein(urb->pipe) ? "in" : "out",
+ (unsigned long) urb->hcpriv,
+ urb->transfer_flags);
+ gig_dbg(level,
+ " transfer_buffer=0x%08lx[%d], actual_length=%d, "
+ "setup_packet=0x%08lx,",
+ (unsigned long) urb->transfer_buffer,
+ urb->transfer_buffer_length, urb->actual_length,
+ (unsigned long) urb->setup_packet);
+ gig_dbg(level,
+ " start_frame=%d, number_of_packets=%d, interval=%d, "
+ "error_count=%d,",
+ urb->start_frame, urb->number_of_packets, urb->interval,
+ urb->error_count);
+ gig_dbg(level,
+ " context=0x%08lx, complete=0x%08lx, "
+ "iso_frame_desc[]={",
+ (unsigned long) urb->context,
+ (unsigned long) urb->complete);
+ for (i = 0; i < urb->number_of_packets; i++) {
+ struct usb_iso_packet_descriptor *pifd
+ = &urb->iso_frame_desc[i];
+ gig_dbg(level,
+ " {offset=%u, length=%u, actual_length=%u, "
+ "status=%u}",
+ pifd->offset, pifd->length, pifd->actual_length,
+ pifd->status);
+ }
+ }
+ gig_dbg(level, "}}");
+#endif
+}
+
+/* read/set modem control bits etc. (m10x only) */
+static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state,
+ unsigned new_state)
+{
+ return -EINVAL;
+}
+
+static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag)
+{
+ return -EINVAL;
+}
+
+static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag)
+{
+ return -EINVAL;
+}
+
+/* set/clear bits in base connection state, return previous state
+ */
+static inline int update_basstate(struct bas_cardstate *ucs,
+ int set, int clear)
+{
+ unsigned long flags;
+ int state;
+
+ spin_lock_irqsave(&ucs->lock, flags);
+ state = ucs->basstate;
+ ucs->basstate = (state & ~clear) | set;
+ spin_unlock_irqrestore(&ucs->lock, flags);
+ return state;
+}
+
+/* error_hangup
+ * hang up any existing connection because of an unrecoverable error
+ * This function may be called from any context and takes care of scheduling
+ * the necessary actions for execution outside of interrupt context.
+ * cs->lock must not be held.
+ * argument:
+ * B channel control structure
+ */
+static inline void error_hangup(struct bc_state *bcs)
+{
+ struct cardstate *cs = bcs->cs;
+
+ gigaset_add_event(cs, &bcs->at_state, EV_HUP, NULL, 0, NULL);
+ gigaset_schedule_event(cs);
+}
+
+/* error_reset
+ * reset Gigaset device because of an unrecoverable error
+ * This function may be called from any context, and takes care of
+ * scheduling the necessary actions for execution outside of interrupt context.
+ * cs->hw.bas->lock must not be held.
+ * argument:
+ * controller state structure
+ */
+static inline void error_reset(struct cardstate *cs)
+{
+ /* reset interrupt pipe to recover (ignore errors) */
+ update_basstate(cs->hw.bas, BS_RESETTING, 0);
+ if (req_submit(cs->bcs, HD_RESET_INTERRUPT_PIPE, 0, BAS_TIMEOUT))
+ /* submission failed, escalate to USB port reset */
+ usb_queue_reset_device(cs->hw.bas->interface);
+}
+
+/* check_pending
+ * check for completion of pending control request
+ * parameter:
+ * ucs hardware specific controller state structure
+ */
+static void check_pending(struct bas_cardstate *ucs)
+{
+ unsigned long flags;
+
+ spin_lock_irqsave(&ucs->lock, flags);
+ switch (ucs->pending) {
+ case 0:
+ break;
+ case HD_OPEN_ATCHANNEL:
+ if (ucs->basstate & BS_ATOPEN)
+ ucs->pending = 0;
+ break;
+ case HD_OPEN_B1CHANNEL:
+ if (ucs->basstate & BS_B1OPEN)
+ ucs->pending = 0;
+ break;
+ case HD_OPEN_B2CHANNEL:
+ if (ucs->basstate & BS_B2OPEN)
+ ucs->pending = 0;
+ break;
+ case HD_CLOSE_ATCHANNEL:
+ if (!(ucs->basstate & BS_ATOPEN))
+ ucs->pending = 0;
+ break;
+ case HD_CLOSE_B1CHANNEL:
+ if (!(ucs->basstate & BS_B1OPEN))
+ ucs->pending = 0;
+ break;
+ case HD_CLOSE_B2CHANNEL:
+ if (!(ucs->basstate & BS_B2OPEN))
+ ucs->pending = 0;
+ break;
+ case HD_DEVICE_INIT_ACK: /* no reply expected */
+ ucs->pending = 0;
+ break;
+ case HD_RESET_INTERRUPT_PIPE:
+ if (!(ucs->basstate & BS_RESETTING))
+ ucs->pending = 0;
+ break;
+ /*
+ * HD_READ_ATMESSAGE and HD_WRITE_ATMESSAGE are handled separately
+ * and should never end up here
+ */
+ default:
+ dev_warn(&ucs->interface->dev,
+ "unknown pending request 0x%02x cleared\n",
+ ucs->pending);
+ ucs->pending = 0;
+ }
+
+ if (!ucs->pending)
+ del_timer(&ucs->timer_ctrl);
+
+ spin_unlock_irqrestore(&ucs->lock, flags);
+}
+
+/* cmd_in_timeout
+ * timeout routine for command input request
+ * argument:
+ * controller state structure
+ */
+static void cmd_in_timeout(unsigned long data)
+{
+ struct cardstate *cs = (struct cardstate *) data;
+ struct bas_cardstate *ucs = cs->hw.bas;
+ int rc;
+
+ if (!ucs->rcvbuf_size) {
+ gig_dbg(DEBUG_USBREQ, "%s: no receive in progress", __func__);
+ return;
+ }
+
+ if (ucs->retry_cmd_in++ >= BAS_RETRY) {
+ dev_err(cs->dev,
+ "control read: timeout, giving up after %d tries\n",
+ ucs->retry_cmd_in);
+ kfree(ucs->rcvbuf);
+ ucs->rcvbuf = NULL;
+ ucs->rcvbuf_size = 0;
+ error_reset(cs);
+ return;
+ }
+
+ gig_dbg(DEBUG_USBREQ, "%s: timeout, retry %d",
+ __func__, ucs->retry_cmd_in);
+ rc = atread_submit(cs, BAS_TIMEOUT);
+ if (rc < 0) {
+ kfree(ucs->rcvbuf);
+ ucs->rcvbuf = NULL;
+ ucs->rcvbuf_size = 0;
+ if (rc != -ENODEV)
+ error_reset(cs);
+ }
+}
+
+/* read_ctrl_callback
+ * USB completion handler for control pipe input
+ * called by the USB subsystem in interrupt context
+ * parameter:
+ * urb USB request block
+ * urb->context = inbuf structure for controller state
+ */
+static void read_ctrl_callback(struct urb *urb)
+{
+ struct inbuf_t *inbuf = urb->context;
+ struct cardstate *cs = inbuf->cs;
+ struct bas_cardstate *ucs = cs->hw.bas;
+ int status = urb->status;
+ unsigned numbytes;
+ int rc;
+
+ update_basstate(ucs, 0, BS_ATRDPEND);
+ wake_up(&ucs->waitqueue);
+ del_timer(&ucs->timer_cmd_in);
+
+ switch (status) {
+ case 0: /* normal completion */
+ numbytes = urb->actual_length;
+ if (unlikely(numbytes != ucs->rcvbuf_size)) {
+ dev_warn(cs->dev,
+ "control read: received %d chars, expected %d\n",
+ numbytes, ucs->rcvbuf_size);
+ if (numbytes > ucs->rcvbuf_size)
+ numbytes = ucs->rcvbuf_size;
+ }
+
+ /* copy received bytes to inbuf, notify event layer */
+ if (gigaset_fill_inbuf(inbuf, ucs->rcvbuf, numbytes)) {
+ gig_dbg(DEBUG_INTR, "%s-->BH", __func__);
+ gigaset_schedule_event(cs);
+ }
+ break;
+
+ case -ENOENT: /* cancelled */
+ case -ECONNRESET: /* cancelled (async) */
+ case -EINPROGRESS: /* pending */
+ case -ENODEV: /* device removed */
+ case -ESHUTDOWN: /* device shut down */
+ /* no further action necessary */
+ gig_dbg(DEBUG_USBREQ, "%s: %s",
+ __func__, get_usb_statmsg(status));
+ break;
+
+ default: /* other errors: retry */
+ if (ucs->retry_cmd_in++ < BAS_RETRY) {
+ gig_dbg(DEBUG_USBREQ, "%s: %s, retry %d", __func__,
+ get_usb_statmsg(status), ucs->retry_cmd_in);
+ rc = atread_submit(cs, BAS_TIMEOUT);
+ if (rc >= 0)
+ /* successfully resubmitted, skip freeing */
+ return;
+ if (rc == -ENODEV)
+ /* disconnect, no further action necessary */
+ break;
+ }
+ dev_err(cs->dev, "control read: %s, giving up after %d tries\n",
+ get_usb_statmsg(status), ucs->retry_cmd_in);
+ error_reset(cs);
+ }
+
+ /* read finished, free buffer */
+ kfree(ucs->rcvbuf);
+ ucs->rcvbuf = NULL;
+ ucs->rcvbuf_size = 0;
+}
+
+/* atread_submit
+ * submit an HD_READ_ATMESSAGE command URB and optionally start a timeout
+ * parameters:
+ * cs controller state structure
+ * timeout timeout in 1/10 sec., 0: none
+ * return value:
+ * 0 on success
+ * -EBUSY if another request is pending
+ * any URB submission error code
+ */
+static int atread_submit(struct cardstate *cs, int timeout)
+{
+ struct bas_cardstate *ucs = cs->hw.bas;
+ int basstate;
+ int ret;
+
+ gig_dbg(DEBUG_USBREQ, "-------> HD_READ_ATMESSAGE (%d)",
+ ucs->rcvbuf_size);
+
+ basstate = update_basstate(ucs, BS_ATRDPEND, 0);
+ if (basstate & BS_ATRDPEND) {
+ dev_err(cs->dev,
+ "could not submit HD_READ_ATMESSAGE: URB busy\n");
+ return -EBUSY;
+ }
+
+ if (basstate & BS_SUSPEND) {
+ dev_notice(cs->dev,
+ "HD_READ_ATMESSAGE not submitted, "
+ "suspend in progress\n");
+ update_basstate(ucs, 0, BS_ATRDPEND);
+ /* treat like disconnect */
+ return -ENODEV;
+ }
+
+ ucs->dr_cmd_in.bRequestType = IN_VENDOR_REQ;
+ ucs->dr_cmd_in.bRequest = HD_READ_ATMESSAGE;
+ ucs->dr_cmd_in.wValue = 0;
+ ucs->dr_cmd_in.wIndex = 0;
+ ucs->dr_cmd_in.wLength = cpu_to_le16(ucs->rcvbuf_size);
+ usb_fill_control_urb(ucs->urb_cmd_in, ucs->udev,
+ usb_rcvctrlpipe(ucs->udev, 0),
+ (unsigned char *) &ucs->dr_cmd_in,
+ ucs->rcvbuf, ucs->rcvbuf_size,
+ read_ctrl_callback, cs->inbuf);
+
+ ret = usb_submit_urb(ucs->urb_cmd_in, GFP_ATOMIC);
+ if (ret != 0) {
+ update_basstate(ucs, 0, BS_ATRDPEND);
+ dev_err(cs->dev, "could not submit HD_READ_ATMESSAGE: %s\n",
+ get_usb_rcmsg(ret));
+ return ret;
+ }
+
+ if (timeout > 0) {
+ gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
+ mod_timer(&ucs->timer_cmd_in, jiffies + timeout * HZ / 10);
+ }
+ return 0;
+}
+
+/* int_in_work
+ * workqueue routine to clear halt on interrupt in endpoint
+ */
+
+static void int_in_work(struct work_struct *work)
+{
+ struct bas_cardstate *ucs =
+ container_of(work, struct bas_cardstate, int_in_wq);
+ struct urb *urb = ucs->urb_int_in;
+ struct cardstate *cs = urb->context;
+ int rc;
+
+ /* clear halt condition */
+ rc = usb_clear_halt(ucs->udev, urb->pipe);
+ gig_dbg(DEBUG_USBREQ, "clear_halt: %s", get_usb_rcmsg(rc));
+ if (rc == 0)
+ /* success, resubmit interrupt read URB */
+ rc = usb_submit_urb(urb, GFP_ATOMIC);
+
+ switch (rc) {
+ case 0: /* success */
+ case -ENODEV: /* device gone */
+ case -EINVAL: /* URB already resubmitted, or terminal badness */
+ break;
+ default: /* failure: try to recover by resetting the device */
+ dev_err(cs->dev, "clear halt failed: %s\n", get_usb_rcmsg(rc));
+ rc = usb_lock_device_for_reset(ucs->udev, ucs->interface);
+ if (rc == 0) {
+ rc = usb_reset_device(ucs->udev);
+ usb_unlock_device(ucs->udev);
+ }
+ }
+ ucs->retry_int_in = 0;
+}
+
+/* int_in_resubmit
+ * timer routine for interrupt read delayed resubmit
+ * argument:
+ * controller state structure
+ */
+static void int_in_resubmit(unsigned long data)
+{
+ struct cardstate *cs = (struct cardstate *) data;
+ struct bas_cardstate *ucs = cs->hw.bas;
+ int rc;
+
+ if (ucs->retry_int_in++ >= BAS_RETRY) {
+ dev_err(cs->dev, "interrupt read: giving up after %d tries\n",
+ ucs->retry_int_in);
+ usb_queue_reset_device(ucs->interface);
+ return;
+ }
+
+ gig_dbg(DEBUG_USBREQ, "%s: retry %d", __func__, ucs->retry_int_in);
+ rc = usb_submit_urb(ucs->urb_int_in, GFP_ATOMIC);
+ if (rc != 0 && rc != -ENODEV) {
+ dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
+ get_usb_rcmsg(rc));
+ usb_queue_reset_device(ucs->interface);
+ }
+}
+
+/* read_int_callback
+ * USB completion handler for interrupt pipe input
+ * called by the USB subsystem in interrupt context
+ * parameter:
+ * urb USB request block
+ * urb->context = controller state structure
+ */
+static void read_int_callback(struct urb *urb)
+{
+ struct cardstate *cs = urb->context;
+ struct bas_cardstate *ucs = cs->hw.bas;
+ struct bc_state *bcs;
+ int status = urb->status;
+ unsigned long flags;
+ int rc;
+ unsigned l;
+ int channel;
+
+ switch (status) {
+ case 0: /* success */
+ ucs->retry_int_in = 0;
+ break;
+ case -EPIPE: /* endpoint stalled */
+ schedule_work(&ucs->int_in_wq);
+ /* fall through */
+ case -ENOENT: /* cancelled */
+ case -ECONNRESET: /* cancelled (async) */
+ case -EINPROGRESS: /* pending */
+ case -ENODEV: /* device removed */
+ case -ESHUTDOWN: /* device shut down */
+ /* no further action necessary */
+ gig_dbg(DEBUG_USBREQ, "%s: %s",
+ __func__, get_usb_statmsg(status));
+ return;
+ case -EPROTO: /* protocol error or unplug */
+ case -EILSEQ:
+ case -ETIME:
+ /* resubmit after delay */
+ gig_dbg(DEBUG_USBREQ, "%s: %s",
+ __func__, get_usb_statmsg(status));
+ mod_timer(&ucs->timer_int_in, jiffies + HZ / 10);
+ return;
+ default: /* other errors: just resubmit */
+ dev_warn(cs->dev, "interrupt read: %s\n",
+ get_usb_statmsg(status));
+ goto resubmit;
+ }
+
+ /* drop incomplete packets even if the missing bytes wouldn't matter */
+ if (unlikely(urb->actual_length < IP_MSGSIZE)) {
+ dev_warn(cs->dev, "incomplete interrupt packet (%d bytes)\n",
+ urb->actual_length);
+ goto resubmit;
+ }
+
+ l = (unsigned) ucs->int_in_buf[1] +
+ (((unsigned) ucs->int_in_buf[2]) << 8);
+
+ gig_dbg(DEBUG_USBREQ, "<-------%d: 0x%02x (%u [0x%02x 0x%02x])",
+ urb->actual_length, (int)ucs->int_in_buf[0], l,
+ (int)ucs->int_in_buf[1], (int)ucs->int_in_buf[2]);
+
+ channel = 0;
+
+ switch (ucs->int_in_buf[0]) {
+ case HD_DEVICE_INIT_OK:
+ update_basstate(ucs, BS_INIT, 0);
+ break;
+
+ case HD_READY_SEND_ATDATA:
+ del_timer(&ucs->timer_atrdy);
+ update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
+ start_cbsend(cs);
+ break;
+
+ case HD_OPEN_B2CHANNEL_ACK:
+ ++channel;
+ case HD_OPEN_B1CHANNEL_ACK:
+ bcs = cs->bcs + channel;
+ update_basstate(ucs, BS_B1OPEN << channel, 0);
+ gigaset_bchannel_up(bcs);
+ break;
+
+ case HD_OPEN_ATCHANNEL_ACK:
+ update_basstate(ucs, BS_ATOPEN, 0);
+ start_cbsend(cs);
+ break;
+
+ case HD_CLOSE_B2CHANNEL_ACK:
+ ++channel;
+ case HD_CLOSE_B1CHANNEL_ACK:
+ bcs = cs->bcs + channel;
+ update_basstate(ucs, 0, BS_B1OPEN << channel);
+ stopurbs(bcs->hw.bas);
+ gigaset_bchannel_down(bcs);
+ break;
+
+ case HD_CLOSE_ATCHANNEL_ACK:
+ update_basstate(ucs, 0, BS_ATOPEN);
+ break;
+
+ case HD_B2_FLOW_CONTROL:
+ ++channel;
+ case HD_B1_FLOW_CONTROL:
+ bcs = cs->bcs + channel;
+ atomic_add((l - BAS_NORMFRAME) * BAS_CORRFRAMES,
+ &bcs->hw.bas->corrbytes);
+ gig_dbg(DEBUG_ISO,
+ "Flow control (channel %d, sub %d): 0x%02x => %d",
+ channel, bcs->hw.bas->numsub, l,
+ atomic_read(&bcs->hw.bas->corrbytes));
+ break;
+
+ case HD_RECEIVEATDATA_ACK: /* AT response ready to be received */
+ if (!l) {
+ dev_warn(cs->dev,
+ "HD_RECEIVEATDATA_ACK with length 0 ignored\n");
+ break;
+ }
+ spin_lock_irqsave(&cs->lock, flags);
+ if (ucs->basstate & BS_ATRDPEND) {
+ spin_unlock_irqrestore(&cs->lock, flags);
+ dev_warn(cs->dev,
+ "HD_RECEIVEATDATA_ACK(%d) during HD_READ_ATMESSAGE(%d) ignored\n",
+ l, ucs->rcvbuf_size);
+ break;
+ }
+ if (ucs->rcvbuf_size) {
+ /* throw away previous buffer - we have no queue */
+ dev_err(cs->dev,
+ "receive AT data overrun, %d bytes lost\n",
+ ucs->rcvbuf_size);
+ kfree(ucs->rcvbuf);
+ ucs->rcvbuf_size = 0;
+ }
+ ucs->rcvbuf = kmalloc(l, GFP_ATOMIC);
+ if (ucs->rcvbuf == NULL) {
+ spin_unlock_irqrestore(&cs->lock, flags);
+ dev_err(cs->dev, "out of memory receiving AT data\n");
+ break;
+ }
+ ucs->rcvbuf_size = l;
+ ucs->retry_cmd_in = 0;
+ rc = atread_submit(cs, BAS_TIMEOUT);
+ if (rc < 0) {
+ kfree(ucs->rcvbuf);
+ ucs->rcvbuf = NULL;
+ ucs->rcvbuf_size = 0;
+ }
+ spin_unlock_irqrestore(&cs->lock, flags);
+ if (rc < 0 && rc != -ENODEV)
+ error_reset(cs);
+ break;
+
+ case HD_RESET_INTERRUPT_PIPE_ACK:
+ update_basstate(ucs, 0, BS_RESETTING);
+ dev_notice(cs->dev, "interrupt pipe reset\n");
+ break;
+
+ case HD_SUSPEND_END:
+ gig_dbg(DEBUG_USBREQ, "HD_SUSPEND_END");
+ break;
+
+ default:
+ dev_warn(cs->dev,
+ "unknown Gigaset signal 0x%02x (%u) ignored\n",
+ (int) ucs->int_in_buf[0], l);
+ }
+
+ check_pending(ucs);
+ wake_up(&ucs->waitqueue);
+
+resubmit:
+ rc = usb_submit_urb(urb, GFP_ATOMIC);
+ if (unlikely(rc != 0 && rc != -ENODEV)) {
+ dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
+ get_usb_rcmsg(rc));
+ error_reset(cs);
+ }
+}
+
+/* read_iso_callback
+ * USB completion handler for B channel isochronous input
+ * called by the USB subsystem in interrupt context
+ * parameter:
+ * urb USB request block of completed request
+ * urb->context = bc_state structure
+ */
+static void read_iso_callback(struct urb *urb)
+{
+ struct bc_state *bcs;
+ struct bas_bc_state *ubc;
+ int status = urb->status;
+ unsigned long flags;
+ int i, rc;
+
+ /* status codes not worth bothering the tasklet with */
+ if (unlikely(status == -ENOENT ||
+ status == -ECONNRESET ||
+ status == -EINPROGRESS ||
+ status == -ENODEV ||
+ status == -ESHUTDOWN)) {
+ gig_dbg(DEBUG_ISO, "%s: %s",
+ __func__, get_usb_statmsg(status));
+ return;
+ }
+
+ bcs = urb->context;
+ ubc = bcs->hw.bas;
+
+ spin_lock_irqsave(&ubc->isoinlock, flags);
+ if (likely(ubc->isoindone == NULL)) {
+ /* pass URB to tasklet */
+ ubc->isoindone = urb;
+ ubc->isoinstatus = status;
+ tasklet_hi_schedule(&ubc->rcvd_tasklet);
+ } else {
+ /* tasklet still busy, drop data and resubmit URB */
+ gig_dbg(DEBUG_ISO, "%s: overrun", __func__);
+ ubc->loststatus = status;
+ for (i = 0; i < BAS_NUMFRAMES; i++) {
+ ubc->isoinlost += urb->iso_frame_desc[i].actual_length;
+ if (unlikely(urb->iso_frame_desc[i].status != 0 &&
+ urb->iso_frame_desc[i].status != -EINPROGRESS))
+ ubc->loststatus = urb->iso_frame_desc[i].status;
+ urb->iso_frame_desc[i].status = 0;
+ urb->iso_frame_desc[i].actual_length = 0;
+ }
+ if (likely(ubc->running)) {
+ /* urb->dev is clobbered by USB subsystem */
+ urb->dev = bcs->cs->hw.bas->udev;
+ urb->transfer_flags = URB_ISO_ASAP;
+ urb->number_of_packets = BAS_NUMFRAMES;
+ rc = usb_submit_urb(urb, GFP_ATOMIC);
+ if (unlikely(rc != 0 && rc != -ENODEV)) {
+ dev_err(bcs->cs->dev,
+ "could not resubmit isoc read URB: %s\n",
+ get_usb_rcmsg(rc));
+ dump_urb(DEBUG_ISO, "isoc read", urb);
+ error_hangup(bcs);
+ }
+ }
+ }
+ spin_unlock_irqrestore(&ubc->isoinlock, flags);
+}
+
+/* write_iso_callback
+ * USB completion handler for B channel isochronous output
+ * called by the USB subsystem in interrupt context
+ * parameter:
+ * urb USB request block of completed request
+ * urb->context = isow_urbctx_t structure
+ */
+static void write_iso_callback(struct urb *urb)
+{
+ struct isow_urbctx_t *ucx;
+ struct bas_bc_state *ubc;
+ int status = urb->status;
+ unsigned long flags;
+
+ /* status codes not worth bothering the tasklet with */
+ if (unlikely(status == -ENOENT ||
+ status == -ECONNRESET ||
+ status == -EINPROGRESS ||
+ status == -ENODEV ||
+ status == -ESHUTDOWN)) {
+ gig_dbg(DEBUG_ISO, "%s: %s",
+ __func__, get_usb_statmsg(status));
+ return;
+ }
+
+ /* pass URB context to tasklet */
+ ucx = urb->context;
+ ubc = ucx->bcs->hw.bas;
+ ucx->status = status;
+
+ spin_lock_irqsave(&ubc->isooutlock, flags);
+ ubc->isooutovfl = ubc->isooutdone;
+ ubc->isooutdone = ucx;
+ spin_unlock_irqrestore(&ubc->isooutlock, flags);
+ tasklet_hi_schedule(&ubc->sent_tasklet);
+}
+
+/* starturbs
+ * prepare and submit USB request blocks for isochronous input and output
+ * argument:
+ * B channel control structure
+ * return value:
+ * 0 on success
+ * < 0 on error (no URBs submitted)
+ */
+static int starturbs(struct bc_state *bcs)
+{
+ struct bas_bc_state *ubc = bcs->hw.bas;
+ struct urb *urb;
+ int j, k;
+ int rc;
+
+ /* initialize L2 reception */
+ if (bcs->proto2 == L2_HDLC)
+ bcs->inputstate |= INS_flag_hunt;
+
+ /* submit all isochronous input URBs */
+ ubc->running = 1;
+ for (k = 0; k < BAS_INURBS; k++) {
+ urb = ubc->isoinurbs[k];
+ if (!urb) {
+ rc = -EFAULT;
+ goto error;
+ }
+
+ urb->dev = bcs->cs->hw.bas->udev;
+ urb->pipe = usb_rcvisocpipe(urb->dev, 3 + 2 * bcs->channel);
+ urb->transfer_flags = URB_ISO_ASAP;
+ urb->transfer_buffer = ubc->isoinbuf + k * BAS_INBUFSIZE;
+ urb->transfer_buffer_length = BAS_INBUFSIZE;
+ urb->number_of_packets = BAS_NUMFRAMES;
+ urb->interval = BAS_FRAMETIME;
+ urb->complete = read_iso_callback;
+ urb->context = bcs;
+ for (j = 0; j < BAS_NUMFRAMES; j++) {
+ urb->iso_frame_desc[j].offset = j * BAS_MAXFRAME;
+ urb->iso_frame_desc[j].length = BAS_MAXFRAME;
+ urb->iso_frame_desc[j].status = 0;
+ urb->iso_frame_desc[j].actual_length = 0;
+ }
+
+ dump_urb(DEBUG_ISO, "Initial isoc read", urb);
+ rc = usb_submit_urb(urb, GFP_ATOMIC);
+ if (rc != 0)
+ goto error;
+ }
+
+ /* initialize L2 transmission */
+ gigaset_isowbuf_init(ubc->isooutbuf, PPP_FLAG);
+
+ /* set up isochronous output URBs for flag idling */
+ for (k = 0; k < BAS_OUTURBS; ++k) {
+ urb = ubc->isoouturbs[k].urb;
+ if (!urb) {
+ rc = -EFAULT;
+ goto error;
+ }
+ urb->dev = bcs->cs->hw.bas->udev;
+ urb->pipe = usb_sndisocpipe(urb->dev, 4 + 2 * bcs->channel);
+ urb->transfer_flags = URB_ISO_ASAP;
+ urb->transfer_buffer = ubc->isooutbuf->data;
+ urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
+ urb->number_of_packets = BAS_NUMFRAMES;
+ urb->interval = BAS_FRAMETIME;
+ urb->complete = write_iso_callback;
+ urb->context = &ubc->isoouturbs[k];
+ for (j = 0; j < BAS_NUMFRAMES; ++j) {
+ urb->iso_frame_desc[j].offset = BAS_OUTBUFSIZE;
+ urb->iso_frame_desc[j].length = BAS_NORMFRAME;
+ urb->iso_frame_desc[j].status = 0;
+ urb->iso_frame_desc[j].actual_length = 0;
+ }
+ ubc->isoouturbs[k].limit = -1;
+ }
+
+ /* keep one URB free, submit the others */
+ for (k = 0; k < BAS_OUTURBS - 1; ++k) {
+ dump_urb(DEBUG_ISO, "Initial isoc write", urb);
+ rc = usb_submit_urb(ubc->isoouturbs[k].urb, GFP_ATOMIC);
+ if (rc != 0)
+ goto error;
+ }
+ dump_urb(DEBUG_ISO, "Initial isoc write (free)", urb);
+ ubc->isooutfree = &ubc->isoouturbs[BAS_OUTURBS - 1];
+ ubc->isooutdone = ubc->isooutovfl = NULL;
+ return 0;
+error:
+ stopurbs(ubc);
+ return rc;
+}
+
+/* stopurbs
+ * cancel the USB request blocks for isochronous input and output
+ * errors are silently ignored
+ * argument:
+ * B channel control structure
+ */
+static void stopurbs(struct bas_bc_state *ubc)
+{
+ int k, rc;
+
+ ubc->running = 0;
+
+ for (k = 0; k < BAS_INURBS; ++k) {
+ rc = usb_unlink_urb(ubc->isoinurbs[k]);
+ gig_dbg(DEBUG_ISO,
+ "%s: isoc input URB %d unlinked, result = %s",
+ __func__, k, get_usb_rcmsg(rc));
+ }
+
+ for (k = 0; k < BAS_OUTURBS; ++k) {
+ rc = usb_unlink_urb(ubc->isoouturbs[k].urb);
+ gig_dbg(DEBUG_ISO,
+ "%s: isoc output URB %d unlinked, result = %s",
+ __func__, k, get_usb_rcmsg(rc));
+ }
+}
+
+/* Isochronous Write - Bottom Half */
+/* =============================== */
+
+/* submit_iso_write_urb
+ * fill and submit the next isochronous write URB
+ * parameters:
+ * ucx context structure containing URB
+ * return value:
+ * number of frames submitted in URB
+ * 0 if URB not submitted because no data available (isooutbuf busy)
+ * error code < 0 on error
+ */
+static int submit_iso_write_urb(struct isow_urbctx_t *ucx)
+{
+ struct urb *urb = ucx->urb;
+ struct bas_bc_state *ubc = ucx->bcs->hw.bas;
+ struct usb_iso_packet_descriptor *ifd;
+ int corrbytes, nframe, rc;
+
+ /* urb->dev is clobbered by USB subsystem */
+ urb->dev = ucx->bcs->cs->hw.bas->udev;
+ urb->transfer_flags = URB_ISO_ASAP;
+ urb->transfer_buffer = ubc->isooutbuf->data;
+ urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
+
+ for (nframe = 0; nframe < BAS_NUMFRAMES; nframe++) {
+ ifd = &urb->iso_frame_desc[nframe];
+
+ /* compute frame length according to flow control */
+ ifd->length = BAS_NORMFRAME;
+ corrbytes = atomic_read(&ubc->corrbytes);
+ if (corrbytes != 0) {
+ gig_dbg(DEBUG_ISO, "%s: corrbytes=%d",
+ __func__, corrbytes);
+ if (corrbytes > BAS_HIGHFRAME - BAS_NORMFRAME)
+ corrbytes = BAS_HIGHFRAME - BAS_NORMFRAME;
+ else if (corrbytes < BAS_LOWFRAME - BAS_NORMFRAME)
+ corrbytes = BAS_LOWFRAME - BAS_NORMFRAME;
+ ifd->length += corrbytes;
+ atomic_add(-corrbytes, &ubc->corrbytes);
+ }
+
+ /* retrieve block of data to send */
+ rc = gigaset_isowbuf_getbytes(ubc->isooutbuf, ifd->length);
+ if (rc < 0) {
+ if (rc == -EBUSY) {
+ gig_dbg(DEBUG_ISO,
+ "%s: buffer busy at frame %d",
+ __func__, nframe);
+ /* tasklet will be restarted from
+ gigaset_isoc_send_skb() */
+ } else {
+ dev_err(ucx->bcs->cs->dev,
+ "%s: buffer error %d at frame %d\n",
+ __func__, rc, nframe);
+ return rc;
+ }
+ break;
+ }
+ ifd->offset = rc;
+ ucx->limit = ubc->isooutbuf->nextread;
+ ifd->status = 0;
+ ifd->actual_length = 0;
+ }
+ if (unlikely(nframe == 0))
+ return 0; /* no data to send */
+ urb->number_of_packets = nframe;
+
+ rc = usb_submit_urb(urb, GFP_ATOMIC);
+ if (unlikely(rc)) {
+ if (rc == -ENODEV)
+ /* device removed - give up silently */
+ gig_dbg(DEBUG_ISO, "%s: disconnected", __func__);
+ else
+ dev_err(ucx->bcs->cs->dev,
+ "could not submit isoc write URB: %s\n",
+ get_usb_rcmsg(rc));
+ return rc;
+ }
+ ++ubc->numsub;
+ return nframe;
+}
+
+/* write_iso_tasklet
+ * tasklet scheduled when an isochronous output URB from the Gigaset device
+ * has completed
+ * parameter:
+ * data B channel state structure
+ */
+static void write_iso_tasklet(unsigned long data)
+{
+ struct bc_state *bcs = (struct bc_state *) data;
+ struct bas_bc_state *ubc = bcs->hw.bas;
+ struct cardstate *cs = bcs->cs;
+ struct isow_urbctx_t *done, *next, *ovfl;
+ struct urb *urb;
+ int status;
+ struct usb_iso_packet_descriptor *ifd;
+ unsigned long flags;
+ int i;
+ struct sk_buff *skb;
+ int len;
+ int rc;
+
+ /* loop while completed URBs arrive in time */
+ for (;;) {
+ if (unlikely(!(ubc->running))) {
+ gig_dbg(DEBUG_ISO, "%s: not running", __func__);
+ return;
+ }
+
+ /* retrieve completed URBs */
+ spin_lock_irqsave(&ubc->isooutlock, flags);
+ done = ubc->isooutdone;
+ ubc->isooutdone = NULL;
+ ovfl = ubc->isooutovfl;
+ ubc->isooutovfl = NULL;
+ spin_unlock_irqrestore(&ubc->isooutlock, flags);
+ if (ovfl) {
+ dev_err(cs->dev, "isoc write underrun\n");
+ error_hangup(bcs);
+ break;
+ }
+ if (!done)
+ break;
+
+ /* submit free URB if available */
+ spin_lock_irqsave(&ubc->isooutlock, flags);
+ next = ubc->isooutfree;
+ ubc->isooutfree = NULL;
+ spin_unlock_irqrestore(&ubc->isooutlock, flags);
+ if (next) {
+ rc = submit_iso_write_urb(next);
+ if (unlikely(rc <= 0 && rc != -ENODEV)) {
+ /* could not submit URB, put it back */
+ spin_lock_irqsave(&ubc->isooutlock, flags);
+ if (ubc->isooutfree == NULL) {
+ ubc->isooutfree = next;
+ next = NULL;
+ }
+ spin_unlock_irqrestore(&ubc->isooutlock, flags);
+ if (next) {
+ /* couldn't put it back */
+ dev_err(cs->dev,
+ "losing isoc write URB\n");
+ error_hangup(bcs);
+ }
+ }
+ }
+
+ /* process completed URB */
+ urb = done->urb;
+ status = done->status;
+ switch (status) {
+ case -EXDEV: /* partial completion */
+ gig_dbg(DEBUG_ISO, "%s: URB partially completed",
+ __func__);
+ /* fall through - what's the difference anyway? */
+ case 0: /* normal completion */
+ /* inspect individual frames
+ * assumptions (for lack of documentation):
+ * - actual_length bytes of first frame in error are
+ * successfully sent
+ * - all following frames are not sent at all
+ */
+ for (i = 0; i < BAS_NUMFRAMES; i++) {
+ ifd = &urb->iso_frame_desc[i];
+ if (ifd->status ||
+ ifd->actual_length != ifd->length) {
+ dev_warn(cs->dev,
+ "isoc write: frame %d[%d/%d]: %s\n",
+ i, ifd->actual_length,
+ ifd->length,
+ get_usb_statmsg(ifd->status));
+ break;
+ }
+ }
+ break;
+ case -EPIPE: /* stall - probably underrun */
+ dev_err(cs->dev, "isoc write: stalled\n");
+ error_hangup(bcs);
+ break;
+ default: /* other errors */
+ dev_warn(cs->dev, "isoc write: %s\n",
+ get_usb_statmsg(status));
+ }
+
+ /* mark the write buffer area covered by this URB as free */
+ if (done->limit >= 0)
+ ubc->isooutbuf->read = done->limit;
+
+ /* mark URB as free */
+ spin_lock_irqsave(&ubc->isooutlock, flags);
+ next = ubc->isooutfree;
+ ubc->isooutfree = done;
+ spin_unlock_irqrestore(&ubc->isooutlock, flags);
+ if (next) {
+ /* only one URB still active - resubmit one */
+ rc = submit_iso_write_urb(next);
+ if (unlikely(rc <= 0 && rc != -ENODEV)) {
+ /* couldn't submit */
+ error_hangup(bcs);
+ }
+ }
+ }
+
+ /* process queued SKBs */
+ while ((skb = skb_dequeue(&bcs->squeue))) {
+ /* copy to output buffer, doing L2 encapsulation */
+ len = skb->len;
+ if (gigaset_isoc_buildframe(bcs, skb->data, len) == -EAGAIN) {
+ /* insufficient buffer space, push back onto queue */
+ skb_queue_head(&bcs->squeue, skb);
+ gig_dbg(DEBUG_ISO, "%s: skb requeued, qlen=%d",
+ __func__, skb_queue_len(&bcs->squeue));
+ break;
+ }
+ skb_pull(skb, len);
+ gigaset_skb_sent(bcs, skb);
+ dev_kfree_skb_any(skb);
+ }
+}
+
+/* Isochronous Read - Bottom Half */
+/* ============================== */
+
+/* read_iso_tasklet
+ * tasklet scheduled when an isochronous input URB from the Gigaset device
+ * has completed
+ * parameter:
+ * data B channel state structure
+ */
+static void read_iso_tasklet(unsigned long data)
+{
+ struct bc_state *bcs = (struct bc_state *) data;
+ struct bas_bc_state *ubc = bcs->hw.bas;
+ struct cardstate *cs = bcs->cs;
+ struct urb *urb;
+ int status;
+ struct usb_iso_packet_descriptor *ifd;
+ char *rcvbuf;
+ unsigned long flags;
+ int totleft, numbytes, offset, frame, rc;
+
+ /* loop while more completed URBs arrive in the meantime */
+ for (;;) {
+ /* retrieve URB */
+ spin_lock_irqsave(&ubc->isoinlock, flags);
+ urb = ubc->isoindone;
+ if (!urb) {
+ spin_unlock_irqrestore(&ubc->isoinlock, flags);
+ return;
+ }
+ status = ubc->isoinstatus;
+ ubc->isoindone = NULL;
+ if (unlikely(ubc->loststatus != -EINPROGRESS)) {
+ dev_warn(cs->dev,
+ "isoc read overrun, URB dropped (status: %s, %d bytes)\n",
+ get_usb_statmsg(ubc->loststatus),
+ ubc->isoinlost);
+ ubc->loststatus = -EINPROGRESS;
+ }
+ spin_unlock_irqrestore(&ubc->isoinlock, flags);
+
+ if (unlikely(!(ubc->running))) {
+ gig_dbg(DEBUG_ISO,
+ "%s: channel not running, "
+ "dropped URB with status: %s",
+ __func__, get_usb_statmsg(status));
+ return;
+ }
+
+ switch (status) {
+ case 0: /* normal completion */
+ break;
+ case -EXDEV: /* inspect individual frames
+ (we do that anyway) */
+ gig_dbg(DEBUG_ISO, "%s: URB partially completed",
+ __func__);
+ break;
+ case -ENOENT:
+ case -ECONNRESET:
+ case -EINPROGRESS:
+ gig_dbg(DEBUG_ISO, "%s: %s",
+ __func__, get_usb_statmsg(status));
+ continue; /* -> skip */
+ case -EPIPE:
+ dev_err(cs->dev, "isoc read: stalled\n");
+ error_hangup(bcs);
+ continue; /* -> skip */
+ default: /* other error */
+ dev_warn(cs->dev, "isoc read: %s\n",
+ get_usb_statmsg(status));
+ goto error;
+ }
+
+ rcvbuf = urb->transfer_buffer;
+ totleft = urb->actual_length;
+ for (frame = 0; totleft > 0 && frame < BAS_NUMFRAMES; frame++) {
+ ifd = &urb->iso_frame_desc[frame];
+ numbytes = ifd->actual_length;
+ switch (ifd->status) {
+ case 0: /* success */
+ break;
+ case -EPROTO: /* protocol error or unplug */
+ case -EILSEQ:
+ case -ETIME:
+ /* probably just disconnected, ignore */
+ gig_dbg(DEBUG_ISO,
+ "isoc read: frame %d[%d]: %s\n",
+ frame, numbytes,
+ get_usb_statmsg(ifd->status));
+ break;
+ default: /* other error */
+ /* report, assume transferred bytes are ok */
+ dev_warn(cs->dev,
+ "isoc read: frame %d[%d]: %s\n",
+ frame, numbytes,
+ get_usb_statmsg(ifd->status));
+ }
+ if (unlikely(numbytes > BAS_MAXFRAME))
+ dev_warn(cs->dev,
+ "isoc read: frame %d[%d]: %s\n",
+ frame, numbytes,
+ "exceeds max frame size");
+ if (unlikely(numbytes > totleft)) {
+ dev_warn(cs->dev,
+ "isoc read: frame %d[%d]: %s\n",
+ frame, numbytes,
+ "exceeds total transfer length");
+ numbytes = totleft;
+ }
+ offset = ifd->offset;
+ if (unlikely(offset + numbytes > BAS_INBUFSIZE)) {
+ dev_warn(cs->dev,
+ "isoc read: frame %d[%d]: %s\n",
+ frame, numbytes,
+ "exceeds end of buffer");
+ numbytes = BAS_INBUFSIZE - offset;
+ }
+ gigaset_isoc_receive(rcvbuf + offset, numbytes, bcs);
+ totleft -= numbytes;
+ }
+ if (unlikely(totleft > 0))
+ dev_warn(cs->dev, "isoc read: %d data bytes missing\n",
+ totleft);
+
+error:
+ /* URB processed, resubmit */
+ for (frame = 0; frame < BAS_NUMFRAMES; frame++) {
+ urb->iso_frame_desc[frame].status = 0;
+ urb->iso_frame_desc[frame].actual_length = 0;
+ }
+ /* urb->dev is clobbered by USB subsystem */
+ urb->dev = bcs->cs->hw.bas->udev;
+ urb->transfer_flags = URB_ISO_ASAP;
+ urb->number_of_packets = BAS_NUMFRAMES;
+ rc = usb_submit_urb(urb, GFP_ATOMIC);
+ if (unlikely(rc != 0 && rc != -ENODEV)) {
+ dev_err(cs->dev,
+ "could not resubmit isoc read URB: %s\n",
+ get_usb_rcmsg(rc));
+ dump_urb(DEBUG_ISO, "resubmit isoc read", urb);
+ error_hangup(bcs);
+ }
+ }
+}
+
+/* Channel Operations */
+/* ================== */
+
+/* req_timeout
+ * timeout routine for control output request
+ * argument:
+ * controller state structure
+ */
+static void req_timeout(unsigned long data)
+{
+ struct cardstate *cs = (struct cardstate *) data;
+ struct bas_cardstate *ucs = cs->hw.bas;
+ int pending;
+ unsigned long flags;
+
+ check_pending(ucs);
+
+ spin_lock_irqsave(&ucs->lock, flags);
+ pending = ucs->pending;
+ ucs->pending = 0;
+ spin_unlock_irqrestore(&ucs->lock, flags);
+
+ switch (pending) {
+ case 0: /* no pending request */
+ gig_dbg(DEBUG_USBREQ, "%s: no request pending", __func__);
+ break;
+
+ case HD_OPEN_ATCHANNEL:
+ dev_err(cs->dev, "timeout opening AT channel\n");
+ error_reset(cs);
+ break;
+
+ case HD_OPEN_B1CHANNEL:
+ dev_err(cs->dev, "timeout opening channel 1\n");
+ error_hangup(&cs->bcs[0]);
+ break;
+
+ case HD_OPEN_B2CHANNEL:
+ dev_err(cs->dev, "timeout opening channel 2\n");
+ error_hangup(&cs->bcs[1]);
+ break;
+
+ case HD_CLOSE_ATCHANNEL:
+ dev_err(cs->dev, "timeout closing AT channel\n");
+ error_reset(cs);
+ break;
+
+ case HD_CLOSE_B1CHANNEL:
+ dev_err(cs->dev, "timeout closing channel 1\n");
+ error_reset(cs);
+ break;
+
+ case HD_CLOSE_B2CHANNEL:
+ dev_err(cs->dev, "timeout closing channel 2\n");
+ error_reset(cs);
+ break;
+
+ case HD_RESET_INTERRUPT_PIPE:
+ /* error recovery escalation */
+ dev_err(cs->dev,
+ "reset interrupt pipe timeout, attempting USB reset\n");
+ usb_queue_reset_device(ucs->interface);
+ break;
+
+ default:
+ dev_warn(cs->dev, "request 0x%02x timed out, clearing\n",
+ pending);
+ }
+
+ wake_up(&ucs->waitqueue);
+}
+
+/* write_ctrl_callback
+ * USB completion handler for control pipe output
+ * called by the USB subsystem in interrupt context
+ * parameter:
+ * urb USB request block of completed request
+ * urb->context = hardware specific controller state structure
+ */
+static void write_ctrl_callback(struct urb *urb)
+{
+ struct bas_cardstate *ucs = urb->context;
+ int status = urb->status;
+ int rc;
+ unsigned long flags;
+
+ /* check status */
+ switch (status) {
+ case 0: /* normal completion */
+ spin_lock_irqsave(&ucs->lock, flags);
+ switch (ucs->pending) {
+ case HD_DEVICE_INIT_ACK: /* no reply expected */
+ del_timer(&ucs->timer_ctrl);
+ ucs->pending = 0;
+ break;
+ }
+ spin_unlock_irqrestore(&ucs->lock, flags);
+ return;
+
+ case -ENOENT: /* cancelled */
+ case -ECONNRESET: /* cancelled (async) */
+ case -EINPROGRESS: /* pending */
+ case -ENODEV: /* device removed */
+ case -ESHUTDOWN: /* device shut down */
+ /* ignore silently */
+ gig_dbg(DEBUG_USBREQ, "%s: %s",
+ __func__, get_usb_statmsg(status));
+ break;
+
+ default: /* any failure */
+ /* don't retry if suspend requested */
+ if (++ucs->retry_ctrl > BAS_RETRY ||
+ (ucs->basstate & BS_SUSPEND)) {
+ dev_err(&ucs->interface->dev,
+ "control request 0x%02x failed: %s\n",
+ ucs->dr_ctrl.bRequest,
+ get_usb_statmsg(status));
+ break; /* give up */
+ }
+ dev_notice(&ucs->interface->dev,
+ "control request 0x%02x: %s, retry %d\n",
+ ucs->dr_ctrl.bRequest, get_usb_statmsg(status),
+ ucs->retry_ctrl);
+ /* urb->dev is clobbered by USB subsystem */
+ urb->dev = ucs->udev;
+ rc = usb_submit_urb(urb, GFP_ATOMIC);
+ if (unlikely(rc)) {
+ dev_err(&ucs->interface->dev,
+ "could not resubmit request 0x%02x: %s\n",
+ ucs->dr_ctrl.bRequest, get_usb_rcmsg(rc));
+ break;
+ }
+ /* resubmitted */
+ return;
+ }
+
+ /* failed, clear pending request */
+ spin_lock_irqsave(&ucs->lock, flags);
+ del_timer(&ucs->timer_ctrl);
+ ucs->pending = 0;
+ spin_unlock_irqrestore(&ucs->lock, flags);
+ wake_up(&ucs->waitqueue);
+}
+
+/* req_submit
+ * submit a control output request without message buffer to the Gigaset base
+ * and optionally start a timeout
+ * parameters:
+ * bcs B channel control structure
+ * req control request code (HD_*)
+ * val control request parameter value (set to 0 if unused)
+ * timeout timeout in seconds (0: no timeout)
+ * return value:
+ * 0 on success
+ * -EBUSY if another request is pending
+ * any URB submission error code
+ */
+static int req_submit(struct bc_state *bcs, int req, int val, int timeout)
+{
+ struct bas_cardstate *ucs = bcs->cs->hw.bas;
+ int ret;
+ unsigned long flags;
+
+ gig_dbg(DEBUG_USBREQ, "-------> 0x%02x (%d)", req, val);
+
+ spin_lock_irqsave(&ucs->lock, flags);
+ if (ucs->pending) {
+ spin_unlock_irqrestore(&ucs->lock, flags);
+ dev_err(bcs->cs->dev,
+ "submission of request 0x%02x failed: "
+ "request 0x%02x still pending\n",
+ req, ucs->pending);
+ return -EBUSY;
+ }
+
+ ucs->dr_ctrl.bRequestType = OUT_VENDOR_REQ;
+ ucs->dr_ctrl.bRequest = req;
+ ucs->dr_ctrl.wValue = cpu_to_le16(val);
+ ucs->dr_ctrl.wIndex = 0;
+ ucs->dr_ctrl.wLength = 0;
+ usb_fill_control_urb(ucs->urb_ctrl, ucs->udev,
+ usb_sndctrlpipe(ucs->udev, 0),
+ (unsigned char *) &ucs->dr_ctrl, NULL, 0,
+ write_ctrl_callback, ucs);
+ ucs->retry_ctrl = 0;
+ ret = usb_submit_urb(ucs->urb_ctrl, GFP_ATOMIC);
+ if (unlikely(ret)) {
+ dev_err(bcs->cs->dev, "could not submit request 0x%02x: %s\n",
+ req, get_usb_rcmsg(ret));
+ spin_unlock_irqrestore(&ucs->lock, flags);
+ return ret;
+ }
+ ucs->pending = req;
+
+ if (timeout > 0) {
+ gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
+ mod_timer(&ucs->timer_ctrl, jiffies + timeout * HZ / 10);
+ }
+
+ spin_unlock_irqrestore(&ucs->lock, flags);
+ return 0;
+}
+
+/* gigaset_init_bchannel
+ * called by common.c to connect a B channel
+ * initialize isochronous I/O and tell the Gigaset base to open the channel
+ * argument:
+ * B channel control structure
+ * return value:
+ * 0 on success, error code < 0 on error
+ */
+static int gigaset_init_bchannel(struct bc_state *bcs)
+{
+ struct cardstate *cs = bcs->cs;
+ int req, ret;
+ unsigned long flags;
+
+ spin_lock_irqsave(&cs->lock, flags);
+ if (unlikely(!cs->connected)) {
+ gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
+ spin_unlock_irqrestore(&cs->lock, flags);
+ return -ENODEV;
+ }
+
+ if (cs->hw.bas->basstate & BS_SUSPEND) {
+ dev_notice(cs->dev,
+ "not starting isoc I/O, suspend in progress\n");
+ spin_unlock_irqrestore(&cs->lock, flags);
+ return -EHOSTUNREACH;
+ }
+
+ ret = starturbs(bcs);
+ if (ret < 0) {
+ spin_unlock_irqrestore(&cs->lock, flags);
+ dev_err(cs->dev,
+ "could not start isoc I/O for channel B%d: %s\n",
+ bcs->channel + 1,
+ ret == -EFAULT ? "null URB" : get_usb_rcmsg(ret));
+ if (ret != -ENODEV)
+ error_hangup(bcs);
+ return ret;
+ }
+
+ req = bcs->channel ? HD_OPEN_B2CHANNEL : HD_OPEN_B1CHANNEL;
+ ret = req_submit(bcs, req, 0, BAS_TIMEOUT);
+ if (ret < 0) {
+ dev_err(cs->dev, "could not open channel B%d\n",
+ bcs->channel + 1);
+ stopurbs(bcs->hw.bas);
+ }
+
+ spin_unlock_irqrestore(&cs->lock, flags);
+ if (ret < 0 && ret != -ENODEV)
+ error_hangup(bcs);
+ return ret;
+}
+
+/* gigaset_close_bchannel
+ * called by common.c to disconnect a B channel
+ * tell the Gigaset base to close the channel
+ * stopping isochronous I/O and LL notification will be done when the
+ * acknowledgement for the close arrives
+ * argument:
+ * B channel control structure
+ * return value:
+ * 0 on success, error code < 0 on error
+ */
+static int gigaset_close_bchannel(struct bc_state *bcs)
+{
+ struct cardstate *cs = bcs->cs;
+ int req, ret;
+ unsigned long flags;
+
+ spin_lock_irqsave(&cs->lock, flags);
+ if (unlikely(!cs->connected)) {
+ spin_unlock_irqrestore(&cs->lock, flags);
+ gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
+ return -ENODEV;
+ }
+
+ if (!(cs->hw.bas->basstate & (bcs->channel ? BS_B2OPEN : BS_B1OPEN))) {
+ /* channel not running: just signal common.c */
+ spin_unlock_irqrestore(&cs->lock, flags);
+ gigaset_bchannel_down(bcs);
+ return 0;
+ }
+
+ /* channel running: tell device to close it */
+ req = bcs->channel ? HD_CLOSE_B2CHANNEL : HD_CLOSE_B1CHANNEL;
+ ret = req_submit(bcs, req, 0, BAS_TIMEOUT);
+ if (ret < 0)
+ dev_err(cs->dev, "closing channel B%d failed\n",
+ bcs->channel + 1);
+
+ spin_unlock_irqrestore(&cs->lock, flags);
+ return ret;
+}
+
+/* Device Operations */
+/* ================= */
+
+/* complete_cb
+ * unqueue first command buffer from queue, waking any sleepers
+ * must be called with cs->cmdlock held
+ * parameter:
+ * cs controller state structure
+ */
+static void complete_cb(struct cardstate *cs)
+{
+ struct cmdbuf_t *cb = cs->cmdbuf;
+
+ /* unqueue completed buffer */
+ cs->cmdbytes -= cs->curlen;
+ gig_dbg(DEBUG_OUTPUT, "write_command: sent %u bytes, %u left",
+ cs->curlen, cs->cmdbytes);
+ if (cb->next != NULL) {
+ cs->cmdbuf = cb->next;
+ cs->cmdbuf->prev = NULL;
+ cs->curlen = cs->cmdbuf->len;
+ } else {
+ cs->cmdbuf = NULL;
+ cs->lastcmdbuf = NULL;
+ cs->curlen = 0;
+ }
+
+ if (cb->wake_tasklet)
+ tasklet_schedule(cb->wake_tasklet);
+
+ kfree(cb);
+}
+
+/* write_command_callback
+ * USB completion handler for AT command transmission
+ * called by the USB subsystem in interrupt context
+ * parameter:
+ * urb USB request block of completed request
+ * urb->context = controller state structure
+ */
+static void write_command_callback(struct urb *urb)
+{
+ struct cardstate *cs = urb->context;
+ struct bas_cardstate *ucs = cs->hw.bas;
+ int status = urb->status;
+ unsigned long flags;
+
+ update_basstate(ucs, 0, BS_ATWRPEND);
+ wake_up(&ucs->waitqueue);
+
+ /* check status */
+ switch (status) {
+ case 0: /* normal completion */
+ break;
+ case -ENOENT: /* cancelled */
+ case -ECONNRESET: /* cancelled (async) */
+ case -EINPROGRESS: /* pending */
+ case -ENODEV: /* device removed */
+ case -ESHUTDOWN: /* device shut down */
+ /* ignore silently */
+ gig_dbg(DEBUG_USBREQ, "%s: %s",
+ __func__, get_usb_statmsg(status));
+ return;
+ default: /* any failure */
+ if (++ucs->retry_cmd_out > BAS_RETRY) {
+ dev_warn(cs->dev,
+ "command write: %s, "
+ "giving up after %d retries\n",
+ get_usb_statmsg(status),
+ ucs->retry_cmd_out);
+ break;
+ }
+ if (ucs->basstate & BS_SUSPEND) {
+ dev_warn(cs->dev,
+ "command write: %s, "
+ "won't retry - suspend requested\n",
+ get_usb_statmsg(status));
+ break;
+ }
+ if (cs->cmdbuf == NULL) {
+ dev_warn(cs->dev,
+ "command write: %s, "
+ "cannot retry - cmdbuf gone\n",
+ get_usb_statmsg(status));
+ break;
+ }
+ dev_notice(cs->dev, "command write: %s, retry %d\n",
+ get_usb_statmsg(status), ucs->retry_cmd_out);
+ if (atwrite_submit(cs, cs->cmdbuf->buf, cs->cmdbuf->len) >= 0)
+ /* resubmitted - bypass regular exit block */
+ return;
+ /* command send failed, assume base still waiting */
+ update_basstate(ucs, BS_ATREADY, 0);
+ }
+
+ spin_lock_irqsave(&cs->cmdlock, flags);
+ if (cs->cmdbuf != NULL)
+ complete_cb(cs);
+ spin_unlock_irqrestore(&cs->cmdlock, flags);
+}
+
+/* atrdy_timeout
+ * timeout routine for AT command transmission
+ * argument:
+ * controller state structure
+ */
+static void atrdy_timeout(unsigned long data)
+{
+ struct cardstate *cs = (struct cardstate *) data;
+ struct bas_cardstate *ucs = cs->hw.bas;
+
+ dev_warn(cs->dev, "timeout waiting for HD_READY_SEND_ATDATA\n");
+
+ /* fake the missing signal - what else can I do? */
+ update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
+ start_cbsend(cs);
+}
+
+/* atwrite_submit
+ * submit an HD_WRITE_ATMESSAGE command URB
+ * parameters:
+ * cs controller state structure
+ * buf buffer containing command to send
+ * len length of command to send
+ * return value:
+ * 0 on success
+ * -EBUSY if another request is pending
+ * any URB submission error code
+ */
+static int atwrite_submit(struct cardstate *cs, unsigned char *buf, int len)
+{
+ struct bas_cardstate *ucs = cs->hw.bas;
+ int rc;
+
+ gig_dbg(DEBUG_USBREQ, "-------> HD_WRITE_ATMESSAGE (%d)", len);
+
+ if (update_basstate(ucs, BS_ATWRPEND, 0) & BS_ATWRPEND) {
+ dev_err(cs->dev,
+ "could not submit HD_WRITE_ATMESSAGE: URB busy\n");
+ return -EBUSY;
+ }
+
+ ucs->dr_cmd_out.bRequestType = OUT_VENDOR_REQ;
+ ucs->dr_cmd_out.bRequest = HD_WRITE_ATMESSAGE;
+ ucs->dr_cmd_out.wValue = 0;
+ ucs->dr_cmd_out.wIndex = 0;
+ ucs->dr_cmd_out.wLength = cpu_to_le16(len);
+ usb_fill_control_urb(ucs->urb_cmd_out, ucs->udev,
+ usb_sndctrlpipe(ucs->udev, 0),
+ (unsigned char *) &ucs->dr_cmd_out, buf, len,
+ write_command_callback, cs);
+ rc = usb_submit_urb(ucs->urb_cmd_out, GFP_ATOMIC);
+ if (unlikely(rc)) {
+ update_basstate(ucs, 0, BS_ATWRPEND);
+ dev_err(cs->dev, "could not submit HD_WRITE_ATMESSAGE: %s\n",
+ get_usb_rcmsg(rc));
+ return rc;
+ }
+
+ /* submitted successfully, start timeout if necessary */
+ if (!(update_basstate(ucs, BS_ATTIMER, BS_ATREADY) & BS_ATTIMER)) {
+ gig_dbg(DEBUG_OUTPUT, "setting ATREADY timeout of %d/10 secs",
+ ATRDY_TIMEOUT);
+ mod_timer(&ucs->timer_atrdy, jiffies + ATRDY_TIMEOUT * HZ / 10);
+ }
+ return 0;
+}
+
+/* start_cbsend
+ * start transmission of AT command queue if necessary
+ * parameter:
+ * cs controller state structure
+ * return value:
+ * 0 on success
+ * error code < 0 on error
+ */
+static int start_cbsend(struct cardstate *cs)
+{
+ struct cmdbuf_t *cb;
+ struct bas_cardstate *ucs = cs->hw.bas;
+ unsigned long flags;
+ int rc;
+ int retval = 0;
+
+ /* check if suspend requested */
+ if (ucs->basstate & BS_SUSPEND) {
+ gig_dbg(DEBUG_OUTPUT, "suspending");
+ return -EHOSTUNREACH;
+ }
+
+ /* check if AT channel is open */
+ if (!(ucs->basstate & BS_ATOPEN)) {
+ gig_dbg(DEBUG_OUTPUT, "AT channel not open");
+ rc = req_submit(cs->bcs, HD_OPEN_ATCHANNEL, 0, BAS_TIMEOUT);
+ if (rc < 0) {
+ /* flush command queue */
+ spin_lock_irqsave(&cs->cmdlock, flags);
+ while (cs->cmdbuf != NULL)
+ complete_cb(cs);
+ spin_unlock_irqrestore(&cs->cmdlock, flags);
+ }
+ return rc;
+ }
+
+ /* try to send first command in queue */
+ spin_lock_irqsave(&cs->cmdlock, flags);
+
+ while ((cb = cs->cmdbuf) != NULL && (ucs->basstate & BS_ATREADY)) {
+ ucs->retry_cmd_out = 0;
+ rc = atwrite_submit(cs, cb->buf, cb->len);
+ if (unlikely(rc)) {
+ retval = rc;
+ complete_cb(cs);
+ }
+ }
+
+ spin_unlock_irqrestore(&cs->cmdlock, flags);
+ return retval;
+}
+
+/* gigaset_write_cmd
+ * This function is called by the device independent part of the driver
+ * to transmit an AT command string to the Gigaset device.
+ * It encapsulates the device specific method for transmission over the
+ * direct USB connection to the base.
+ * The command string is added to the queue of commands to send, and
+ * USB transmission is started if necessary.
+ * parameters:
+ * cs controller state structure
+ * cb command buffer structure
+ * return value:
+ * number of bytes queued on success
+ * error code < 0 on error
+ */
+static int gigaset_write_cmd(struct cardstate *cs, struct cmdbuf_t *cb)
+{
+ unsigned long flags;
+ int rc;
+
+ gigaset_dbg_buffer(cs->mstate != MS_LOCKED ?
+ DEBUG_TRANSCMD : DEBUG_LOCKCMD,
+ "CMD Transmit", cb->len, cb->buf);
+
+ /* translate "+++" escape sequence sent as a single separate command
+ * into "close AT channel" command for error recovery
+ * The next command will reopen the AT channel automatically.
+ */
+ if (cb->len == 3 && !memcmp(cb->buf, "+++", 3)) {
+ /* If an HD_RECEIVEATDATA_ACK message remains unhandled
+ * because of an error, the base never sends another one.
+ * The response channel is thus effectively blocked.
+ * Closing and reopening the AT channel does *not* clear
+ * this condition.
+ * As a stopgap measure, submit a zero-length AT read
+ * before closing the AT channel. This has the undocumented
+ * effect of triggering a new HD_RECEIVEATDATA_ACK message
+ * from the base if necessary.
+ * The subsequent AT channel close then discards any pending
+ * messages.
+ */
+ spin_lock_irqsave(&cs->lock, flags);
+ if (!(cs->hw.bas->basstate & BS_ATRDPEND)) {
+ kfree(cs->hw.bas->rcvbuf);
+ cs->hw.bas->rcvbuf = NULL;
+ cs->hw.bas->rcvbuf_size = 0;
+ cs->hw.bas->retry_cmd_in = 0;
+ atread_submit(cs, 0);
+ }
+ spin_unlock_irqrestore(&cs->lock, flags);
+
+ rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, BAS_TIMEOUT);
+ if (cb->wake_tasklet)
+ tasklet_schedule(cb->wake_tasklet);
+ if (!rc)
+ rc = cb->len;
+ kfree(cb);
+ return rc;
+ }
+
+ spin_lock_irqsave(&cs->cmdlock, flags);
+ cb->prev = cs->lastcmdbuf;
+ if (cs->lastcmdbuf)
+ cs->lastcmdbuf->next = cb;
+ else {
+ cs->cmdbuf = cb;
+ cs->curlen = cb->len;
+ }
+ cs->cmdbytes += cb->len;
+ cs->lastcmdbuf = cb;
+ spin_unlock_irqrestore(&cs->cmdlock, flags);
+
+ spin_lock_irqsave(&cs->lock, flags);
+ if (unlikely(!cs->connected)) {
+ spin_unlock_irqrestore(&cs->lock, flags);
+ gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
+ /* flush command queue */
+ spin_lock_irqsave(&cs->cmdlock, flags);
+ while (cs->cmdbuf != NULL)
+ complete_cb(cs);
+ spin_unlock_irqrestore(&cs->cmdlock, flags);
+ return -ENODEV;
+ }
+ rc = start_cbsend(cs);
+ spin_unlock_irqrestore(&cs->lock, flags);
+ return rc < 0 ? rc : cb->len;
+}
+
+/* gigaset_write_room
+ * tty_driver.write_room interface routine
+ * return number of characters the driver will accept to be written via
+ * gigaset_write_cmd
+ * parameter:
+ * controller state structure
+ * return value:
+ * number of characters
+ */
+static int gigaset_write_room(struct cardstate *cs)
+{
+ return IF_WRITEBUF;
+}
+
+/* gigaset_chars_in_buffer
+ * tty_driver.chars_in_buffer interface routine
+ * return number of characters waiting to be sent
+ * parameter:
+ * controller state structure
+ * return value:
+ * number of characters
+ */
+static int gigaset_chars_in_buffer(struct cardstate *cs)
+{
+ return cs->cmdbytes;
+}
+
+/* gigaset_brkchars
+ * implementation of ioctl(GIGASET_BRKCHARS)
+ * parameter:
+ * controller state structure
+ * return value:
+ * -EINVAL (unimplemented function)
+ */
+static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6])
+{
+ return -EINVAL;
+}
+
+
+/* Device Initialization/Shutdown */
+/* ============================== */
+
+/* Free hardware dependent part of the B channel structure
+ * parameter:
+ * bcs B channel structure
+ */
+static void gigaset_freebcshw(struct bc_state *bcs)
+{
+ struct bas_bc_state *ubc = bcs->hw.bas;
+ int i;
+
+ if (!ubc)
+ return;
+
+ /* kill URBs and tasklets before freeing - better safe than sorry */
+ ubc->running = 0;
+ gig_dbg(DEBUG_INIT, "%s: killing isoc URBs", __func__);
+ for (i = 0; i < BAS_OUTURBS; ++i) {
+ usb_kill_urb(ubc->isoouturbs[i].urb);
+ usb_free_urb(ubc->isoouturbs[i].urb);
+ }
+ for (i = 0; i < BAS_INURBS; ++i) {
+ usb_kill_urb(ubc->isoinurbs[i]);
+ usb_free_urb(ubc->isoinurbs[i]);
+ }
+ tasklet_kill(&ubc->sent_tasklet);
+ tasklet_kill(&ubc->rcvd_tasklet);
+ kfree(ubc->isooutbuf);
+ kfree(ubc);
+ bcs->hw.bas = NULL;
+}
+
+/* Initialize hardware dependent part of the B channel structure
+ * parameter:
+ * bcs B channel structure
+ * return value:
+ * 0 on success, error code < 0 on failure
+ */
+static int gigaset_initbcshw(struct bc_state *bcs)
+{
+ int i;
+ struct bas_bc_state *ubc;
+
+ bcs->hw.bas = ubc = kmalloc(sizeof(struct bas_bc_state), GFP_KERNEL);
+ if (!ubc) {
+ pr_err("out of memory\n");
+ return -ENOMEM;
+ }
+
+ ubc->running = 0;
+ atomic_set(&ubc->corrbytes, 0);
+ spin_lock_init(&ubc->isooutlock);
+ for (i = 0; i < BAS_OUTURBS; ++i) {
+ ubc->isoouturbs[i].urb = NULL;
+ ubc->isoouturbs[i].bcs = bcs;
+ }
+ ubc->isooutdone = ubc->isooutfree = ubc->isooutovfl = NULL;
+ ubc->numsub = 0;
+ ubc->isooutbuf = kmalloc(sizeof(struct isowbuf_t), GFP_KERNEL);
+ if (!ubc->isooutbuf) {
+ pr_err("out of memory\n");
+ kfree(ubc);
+ bcs->hw.bas = NULL;
+ return -ENOMEM;
+ }
+ tasklet_init(&ubc->sent_tasklet,
+ write_iso_tasklet, (unsigned long) bcs);
+
+ spin_lock_init(&ubc->isoinlock);
+ for (i = 0; i < BAS_INURBS; ++i)
+ ubc->isoinurbs[i] = NULL;
+ ubc->isoindone = NULL;
+ ubc->loststatus = -EINPROGRESS;
+ ubc->isoinlost = 0;
+ ubc->seqlen = 0;
+ ubc->inbyte = 0;
+ ubc->inbits = 0;
+ ubc->goodbytes = 0;
+ ubc->alignerrs = 0;
+ ubc->fcserrs = 0;
+ ubc->frameerrs = 0;
+ ubc->giants = 0;
+ ubc->runts = 0;
+ ubc->aborts = 0;
+ ubc->shared0s = 0;
+ ubc->stolen0s = 0;
+ tasklet_init(&ubc->rcvd_tasklet,
+ read_iso_tasklet, (unsigned long) bcs);
+ return 0;
+}
+
+static void gigaset_reinitbcshw(struct bc_state *bcs)
+{
+ struct bas_bc_state *ubc = bcs->hw.bas;
+
+ bcs->hw.bas->running = 0;
+ atomic_set(&bcs->hw.bas->corrbytes, 0);
+ bcs->hw.bas->numsub = 0;
+ spin_lock_init(&ubc->isooutlock);
+ spin_lock_init(&ubc->isoinlock);
+ ubc->loststatus = -EINPROGRESS;
+}
+
+static void gigaset_freecshw(struct cardstate *cs)
+{
+ /* timers, URBs and rcvbuf are disposed of in disconnect */
+ kfree(cs->hw.bas->int_in_buf);
+ kfree(cs->hw.bas);
+ cs->hw.bas = NULL;
+}
+
+/* Initialize hardware dependent part of the cardstate structure
+ * parameter:
+ * cs cardstate structure
+ * return value:
+ * 0 on success, error code < 0 on failure
+ */
+static int gigaset_initcshw(struct cardstate *cs)
+{
+ struct bas_cardstate *ucs;
+
+ cs->hw.bas = ucs = kmalloc(sizeof *ucs, GFP_KERNEL);
+ if (!ucs) {
+ pr_err("out of memory\n");
+ return -ENOMEM;
+ }
+ ucs->int_in_buf = kmalloc(IP_MSGSIZE, GFP_KERNEL);
+ if (!ucs->int_in_buf) {
+ kfree(ucs);
+ pr_err("out of memory\n");
+ return -ENOMEM;
+ }
+
+ ucs->urb_cmd_in = NULL;
+ ucs->urb_cmd_out = NULL;
+ ucs->rcvbuf = NULL;
+ ucs->rcvbuf_size = 0;
+
+ spin_lock_init(&ucs->lock);
+ ucs->pending = 0;
+
+ ucs->basstate = 0;
+ setup_timer(&ucs->timer_ctrl, req_timeout, (unsigned long) cs);
+ setup_timer(&ucs->timer_atrdy, atrdy_timeout, (unsigned long) cs);
+ setup_timer(&ucs->timer_cmd_in, cmd_in_timeout, (unsigned long) cs);
+ setup_timer(&ucs->timer_int_in, int_in_resubmit, (unsigned long) cs);
+ init_waitqueue_head(&ucs->waitqueue);
+ INIT_WORK(&ucs->int_in_wq, int_in_work);
+
+ return 0;
+}
+
+/* freeurbs
+ * unlink and deallocate all URBs unconditionally
+ * caller must make sure that no commands are still in progress
+ * parameter:
+ * cs controller state structure
+ */
+static void freeurbs(struct cardstate *cs)
+{
+ struct bas_cardstate *ucs = cs->hw.bas;
+ struct bas_bc_state *ubc;
+ int i, j;
+
+ gig_dbg(DEBUG_INIT, "%s: killing URBs", __func__);
+ for (j = 0; j < BAS_CHANNELS; ++j) {
+ ubc = cs->bcs[j].hw.bas;
+ for (i = 0; i < BAS_OUTURBS; ++i) {
+ usb_kill_urb(ubc->isoouturbs[i].urb);
+ usb_free_urb(ubc->isoouturbs[i].urb);
+ ubc->isoouturbs[i].urb = NULL;
+ }
+ for (i = 0; i < BAS_INURBS; ++i) {
+ usb_kill_urb(ubc->isoinurbs[i]);
+ usb_free_urb(ubc->isoinurbs[i]);
+ ubc->isoinurbs[i] = NULL;
+ }
+ }
+ usb_kill_urb(ucs->urb_int_in);
+ usb_free_urb(ucs->urb_int_in);
+ ucs->urb_int_in = NULL;
+ usb_kill_urb(ucs->urb_cmd_out);
+ usb_free_urb(ucs->urb_cmd_out);
+ ucs->urb_cmd_out = NULL;
+ usb_kill_urb(ucs->urb_cmd_in);
+ usb_free_urb(ucs->urb_cmd_in);
+ ucs->urb_cmd_in = NULL;
+ usb_kill_urb(ucs->urb_ctrl);
+ usb_free_urb(ucs->urb_ctrl);
+ ucs->urb_ctrl = NULL;
+}
+
+/* gigaset_probe
+ * This function is called when a new USB device is connected.
+ * It checks whether the new device is handled by this driver.
+ */
+static int gigaset_probe(struct usb_interface *interface,
+ const struct usb_device_id *id)
+{
+ struct usb_host_interface *hostif;
+ struct usb_device *udev = interface_to_usbdev(interface);
+ struct cardstate *cs = NULL;
+ struct bas_cardstate *ucs = NULL;
+ struct bas_bc_state *ubc;
+ struct usb_endpoint_descriptor *endpoint;
+ int i, j;
+ int rc;
+
+ gig_dbg(DEBUG_INIT,
+ "%s: Check if device matches .. (Vendor: 0x%x, Product: 0x%x)",
+ __func__, le16_to_cpu(udev->descriptor.idVendor),
+ le16_to_cpu(udev->descriptor.idProduct));
+
+ /* set required alternate setting */
+ hostif = interface->cur_altsetting;
+ if (hostif->desc.bAlternateSetting != 3) {
+ gig_dbg(DEBUG_INIT,
+ "%s: wrong alternate setting %d - trying to switch",
+ __func__, hostif->desc.bAlternateSetting);
+ if (usb_set_interface(udev, hostif->desc.bInterfaceNumber, 3)
+ < 0) {
+ dev_warn(&udev->dev, "usb_set_interface failed, "
+ "device %d interface %d altsetting %d\n",
+ udev->devnum, hostif->desc.bInterfaceNumber,
+ hostif->desc.bAlternateSetting);
+ return -ENODEV;
+ }
+ hostif = interface->cur_altsetting;
+ }
+
+ /* Reject application specific interfaces
+ */
+ if (hostif->desc.bInterfaceClass != 255) {
+ dev_warn(&udev->dev, "%s: bInterfaceClass == %d\n",
+ __func__, hostif->desc.bInterfaceClass);
+ return -ENODEV;
+ }
+
+ dev_info(&udev->dev,
+ "%s: Device matched (Vendor: 0x%x, Product: 0x%x)\n",
+ __func__, le16_to_cpu(udev->descriptor.idVendor),
+ le16_to_cpu(udev->descriptor.idProduct));
+
+ /* allocate memory for our device state and initialize it */
+ cs = gigaset_initcs(driver, BAS_CHANNELS, 0, 0, cidmode,
+ GIGASET_MODULENAME);
+ if (!cs)
+ return -ENODEV;
+ ucs = cs->hw.bas;
+
+ /* save off device structure ptrs for later use */
+ usb_get_dev(udev);
+ ucs->udev = udev;
+ ucs->interface = interface;
+ cs->dev = &interface->dev;
+
+ /* allocate URBs:
+ * - one for the interrupt pipe
+ * - three for the different uses of the default control pipe
+ * - three for each isochronous pipe
+ */
+ if (!(ucs->urb_int_in = usb_alloc_urb(0, GFP_KERNEL)) ||
+ !(ucs->urb_cmd_in = usb_alloc_urb(0, GFP_KERNEL)) ||
+ !(ucs->urb_cmd_out = usb_alloc_urb(0, GFP_KERNEL)) ||
+ !(ucs->urb_ctrl = usb_alloc_urb(0, GFP_KERNEL)))
+ goto allocerr;
+
+ for (j = 0; j < BAS_CHANNELS; ++j) {
+ ubc = cs->bcs[j].hw.bas;
+ for (i = 0; i < BAS_OUTURBS; ++i)
+ if (!(ubc->isoouturbs[i].urb =
+ usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
+ goto allocerr;
+ for (i = 0; i < BAS_INURBS; ++i)
+ if (!(ubc->isoinurbs[i] =
+ usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
+ goto allocerr;
+ }
+
+ ucs->rcvbuf = NULL;
+ ucs->rcvbuf_size = 0;
+
+ /* Fill the interrupt urb and send it to the core */
+ endpoint = &hostif->endpoint[0].desc;
+ usb_fill_int_urb(ucs->urb_int_in, udev,
+ usb_rcvintpipe(udev,
+ usb_endpoint_num(endpoint)),
+ ucs->int_in_buf, IP_MSGSIZE, read_int_callback, cs,
+ endpoint->bInterval);
+ rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);
+ if (rc != 0) {
+ dev_err(cs->dev, "could not submit interrupt URB: %s\n",
+ get_usb_rcmsg(rc));
+ goto error;
+ }
+ ucs->retry_int_in = 0;
+
+ /* tell the device that the driver is ready */
+ rc = req_submit(cs->bcs, HD_DEVICE_INIT_ACK, 0, 0);
+ if (rc != 0)
+ goto error;
+
+ /* tell common part that the device is ready */
+ if (startmode == SM_LOCKED)
+ cs->mstate = MS_LOCKED;
+
+ /* save address of controller structure */
+ usb_set_intfdata(interface, cs);
+
+ rc = gigaset_start(cs);
+ if (rc < 0)
+ goto error;
+
+ return 0;
+
+allocerr:
+ dev_err(cs->dev, "could not allocate URBs\n");
+ rc = -ENOMEM;
+error:
+ freeurbs(cs);
+ usb_set_intfdata(interface, NULL);
+ usb_put_dev(udev);
+ gigaset_freecs(cs);
+ return rc;
+}
+
+/* gigaset_disconnect
+ * This function is called when the Gigaset base is unplugged.
+ */
+static void gigaset_disconnect(struct usb_interface *interface)
+{
+ struct cardstate *cs;
+ struct bas_cardstate *ucs;
+ int j;
+
+ cs = usb_get_intfdata(interface);
+
+ ucs = cs->hw.bas;
+
+ dev_info(cs->dev, "disconnecting Gigaset base\n");
+
+ /* mark base as not ready, all channels disconnected */
+ ucs->basstate = 0;
+
+ /* tell LL all channels are down */
+ for (j = 0; j < BAS_CHANNELS; ++j)
+ gigaset_bchannel_down(cs->bcs + j);
+
+ /* stop driver (common part) */
+ gigaset_stop(cs);
+
+ /* stop delayed work and URBs, free ressources */
+ del_timer_sync(&ucs->timer_ctrl);
+ del_timer_sync(&ucs->timer_atrdy);
+ del_timer_sync(&ucs->timer_cmd_in);
+ del_timer_sync(&ucs->timer_int_in);
+ cancel_work_sync(&ucs->int_in_wq);
+ freeurbs(cs);
+ usb_set_intfdata(interface, NULL);
+ kfree(ucs->rcvbuf);
+ ucs->rcvbuf = NULL;
+ ucs->rcvbuf_size = 0;
+ usb_put_dev(ucs->udev);
+ ucs->interface = NULL;
+ ucs->udev = NULL;
+ cs->dev = NULL;
+ gigaset_freecs(cs);
+}
+
+/* gigaset_suspend
+ * This function is called before the USB connection is suspended
+ * or before the USB device is reset.
+ * In the latter case, message == PMSG_ON.
+ */
+static int gigaset_suspend(struct usb_interface *intf, pm_message_t message)
+{
+ struct cardstate *cs = usb_get_intfdata(intf);
+ struct bas_cardstate *ucs = cs->hw.bas;
+ int rc;
+
+ /* set suspend flag; this stops AT command/response traffic */
+ if (update_basstate(ucs, BS_SUSPEND, 0) & BS_SUSPEND) {
+ gig_dbg(DEBUG_SUSPEND, "already suspended");
+ return 0;
+ }
+
+ /* wait a bit for blocking conditions to go away */
+ rc = wait_event_timeout(ucs->waitqueue,
+ !(ucs->basstate &
+ (BS_B1OPEN | BS_B2OPEN | BS_ATRDPEND | BS_ATWRPEND)),
+ BAS_TIMEOUT * HZ / 10);
+ gig_dbg(DEBUG_SUSPEND, "wait_event_timeout() -> %d", rc);
+
+ /* check for conditions preventing suspend */
+ if (ucs->basstate & (BS_B1OPEN | BS_B2OPEN | BS_ATRDPEND | BS_ATWRPEND)) {
+ dev_warn(cs->dev, "cannot suspend:\n");
+ if (ucs->basstate & BS_B1OPEN)
+ dev_warn(cs->dev, " B channel 1 open\n");
+ if (ucs->basstate & BS_B2OPEN)
+ dev_warn(cs->dev, " B channel 2 open\n");
+ if (ucs->basstate & BS_ATRDPEND)
+ dev_warn(cs->dev, " receiving AT reply\n");
+ if (ucs->basstate & BS_ATWRPEND)
+ dev_warn(cs->dev, " sending AT command\n");
+ update_basstate(ucs, 0, BS_SUSPEND);
+ return -EBUSY;
+ }
+
+ /* close AT channel if open */
+ if (ucs->basstate & BS_ATOPEN) {
+ gig_dbg(DEBUG_SUSPEND, "closing AT channel");
+ rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, 0);
+ if (rc) {
+ update_basstate(ucs, 0, BS_SUSPEND);
+ return rc;
+ }
+ wait_event_timeout(ucs->waitqueue, !ucs->pending,
+ BAS_TIMEOUT * HZ / 10);
+ /* in case of timeout, proceed anyway */
+ }
+
+ /* kill all URBs and delayed work that might still be pending */
+ usb_kill_urb(ucs->urb_ctrl);
+ usb_kill_urb(ucs->urb_int_in);
+ del_timer_sync(&ucs->timer_ctrl);
+ del_timer_sync(&ucs->timer_atrdy);
+ del_timer_sync(&ucs->timer_cmd_in);
+ del_timer_sync(&ucs->timer_int_in);
+
+ /* don't try to cancel int_in_wq from within reset as it
+ * might be the one requesting the reset
+ */
+ if (message.event != PM_EVENT_ON)
+ cancel_work_sync(&ucs->int_in_wq);
+
+ gig_dbg(DEBUG_SUSPEND, "suspend complete");
+ return 0;
+}
+
+/* gigaset_resume
+ * This function is called after the USB connection has been resumed.
+ */
+static int gigaset_resume(struct usb_interface *intf)
+{
+ struct cardstate *cs = usb_get_intfdata(intf);
+ struct bas_cardstate *ucs = cs->hw.bas;
+ int rc;
+
+ /* resubmit interrupt URB for spontaneous messages from base */
+ rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);
+ if (rc) {
+ dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
+ get_usb_rcmsg(rc));
+ return rc;
+ }
+ ucs->retry_int_in = 0;
+
+ /* clear suspend flag to reallow activity */
+ update_basstate(ucs, 0, BS_SUSPEND);
+
+ gig_dbg(DEBUG_SUSPEND, "resume complete");
+ return 0;
+}
+
+/* gigaset_pre_reset
+ * This function is called before the USB connection is reset.
+ */
+static int gigaset_pre_reset(struct usb_interface *intf)
+{
+ /* handle just like suspend */
+ return gigaset_suspend(intf, PMSG_ON);
+}
+
+/* gigaset_post_reset
+ * This function is called after the USB connection has been reset.
+ */
+static int gigaset_post_reset(struct usb_interface *intf)
+{
+ /* FIXME: send HD_DEVICE_INIT_ACK? */
+
+ /* resume operations */
+ return gigaset_resume(intf);
+}
+
+
+static const struct gigaset_ops gigops = {
+ gigaset_write_cmd,
+ gigaset_write_room,
+ gigaset_chars_in_buffer,
+ gigaset_brkchars,
+ gigaset_init_bchannel,
+ gigaset_close_bchannel,
+ gigaset_initbcshw,
+ gigaset_freebcshw,
+ gigaset_reinitbcshw,
+ gigaset_initcshw,
+ gigaset_freecshw,
+ gigaset_set_modem_ctrl,
+ gigaset_baud_rate,
+ gigaset_set_line_ctrl,
+ gigaset_isoc_send_skb,
+ gigaset_isoc_input,
+};
+
+/* bas_gigaset_init
+ * This function is called after the kernel module is loaded.
+ */
+static int __init bas_gigaset_init(void)
+{
+ int result;
+
+ /* allocate memory for our driver state and initialize it */
+ driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS,
+ GIGASET_MODULENAME, GIGASET_DEVNAME,
+ &gigops, THIS_MODULE);
+ if (driver == NULL)
+ goto error;
+
+ /* register this driver with the USB subsystem */
+ result = usb_register(&gigaset_usb_driver);
+ if (result < 0) {
+ pr_err("error %d registering USB driver\n", -result);
+ goto error;
+ }
+
+ pr_info(DRIVER_DESC "\n");
+ return 0;
+
+error:
+ if (driver)
+ gigaset_freedriver(driver);
+ driver = NULL;
+ return -1;
+}
+
+/* bas_gigaset_exit
+ * This function is called before the kernel module is unloaded.
+ */
+static void __exit bas_gigaset_exit(void)
+{
+ struct bas_cardstate *ucs;
+ int i;
+
+ gigaset_blockdriver(driver); /* => probe will fail
+ * => no gigaset_start any more
+ */
+
+ /* stop all connected devices */
+ for (i = 0; i < driver->minors; i++) {
+ if (gigaset_shutdown(driver->cs + i) < 0)
+ continue; /* no device */
+ /* from now on, no isdn callback should be possible */
+
+ /* close all still open channels */
+ ucs = driver->cs[i].hw.bas;
+ if (ucs->basstate & BS_B1OPEN) {
+ gig_dbg(DEBUG_INIT, "closing B1 channel");
+ usb_control_msg(ucs->udev,
+ usb_sndctrlpipe(ucs->udev, 0),
+ HD_CLOSE_B1CHANNEL, OUT_VENDOR_REQ,
+ 0, 0, NULL, 0, BAS_TIMEOUT);
+ }
+ if (ucs->basstate & BS_B2OPEN) {
+ gig_dbg(DEBUG_INIT, "closing B2 channel");
+ usb_control_msg(ucs->udev,
+ usb_sndctrlpipe(ucs->udev, 0),
+ HD_CLOSE_B2CHANNEL, OUT_VENDOR_REQ,
+ 0, 0, NULL, 0, BAS_TIMEOUT);
+ }
+ if (ucs->basstate & BS_ATOPEN) {
+ gig_dbg(DEBUG_INIT, "closing AT channel");
+ usb_control_msg(ucs->udev,
+ usb_sndctrlpipe(ucs->udev, 0),
+ HD_CLOSE_ATCHANNEL, OUT_VENDOR_REQ,
+ 0, 0, NULL, 0, BAS_TIMEOUT);
+ }
+ ucs->basstate = 0;
+ }
+
+ /* deregister this driver with the USB subsystem */
+ usb_deregister(&gigaset_usb_driver);
+ /* this will call the disconnect-callback */
+ /* from now on, no disconnect/probe callback should be running */
+
+ gigaset_freedriver(driver);
+ driver = NULL;
+}
+
+
+module_init(bas_gigaset_init);
+module_exit(bas_gigaset_exit);
+
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
Code Review / kvmfornfv.git / blobdiff